PoolRx Black Spa Unit/Algaecide 400-1000 Gallon Spas
The for Spa's Black unit supports 400 - 1000 gallon spas or fountains. is an easy-to-use algaecide that reduces chemical demand, improves water quality, lasts for up to 6 months, contains a proprietary blend of minerals that continuously and effectively eliminates algae. Simply start with fresh water and a clean filter and pick the correct sized Spa unit based on total gallons, then, drop the Spa unit into the pump basket or skimmer. The specially treated alloy cylinder is packed with the mineral formulation.